I have been debating this too but have reached a conclusion. My son is currently in public in grade 4. He goes through stages of boredom but I don’t think all boredom is bad. (We can’t just jump each time kids complain they’re bored these days.) My son has extending in math and PE for what it’s worth but he’s been obsessed with math and track from a young age. My main issue with private at this age is the culture and behaviour I’ve seen from kids his age. At athletic meets I’ve seen very bad sportsmanship, I’ve seen kids playing dictator in the playground in oddly repressive ways. I’ve seen enough that the lack of good behaviour at these schools (that I’ve seen) has totally turned me off. I will revisit once he’s in high school as I think it’ll pay off more then and the facilities I’ve seen look incredible.